Added :tier1_loom and :tier1_loom_serviceability test groups.

test/hotspot/jtreg/TEST.groups

@@ -75,6 +75,17 @@ hotspot_native_sanity = \
 hotspot_containers = \
   containers
 
+tier1_loom = \
+  :tier1_loom_serviceability
+
+tier1_loom_serviceability = \
+  serviceability/jvmti/ContFramePopTest \
+  serviceability/jvmti/ContinuationTest \
+  serviceability/jvmti/ContStackDepthTest \
+  serviceability/jvmti/ContYieldBreakPointTest \
+  serviceability/jvmti/DoContinueSingleStepTest \
+  serviceability/jvmti/FiberTest \
+
 tier1_common = \
   sanity/BasicVMTest.java \
   gtest/GTestWrapper.java